Persons believed to be members of the Communist Party of the United States of America could not be required to register as party members with the SACB because that would violate their self-incrimination rights under the Fifth Amendment.

Brennan, joined by Warren, Black, Douglas, Clark, Harlan, Stewart, Fortas</td></tr><tr><th scope="row" style="text-align:left">Concurrence</th><td>
Black</td></tr><tr><th scope="row" style="text-align:left">Concurrence</th><td>
Clark</td></tr><tr><td colspan="2" style="text-align:center">
White took no part in the consideration or decision of the case.</td></tr></table>